US20240019671A1 - Optical system, image pickup apparatus, and optical apparatus - Google Patents

Optical system, image pickup apparatus, and optical apparatus Download PDF

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Publication number
US20240019671A1
US20240019671A1 US18/349,554 US202318349554A US2024019671A1 US 20240019671 A1 US20240019671 A1 US 20240019671A1 US 202318349554 A US202318349554 A US 202318349554A US 2024019671 A1 US2024019671 A1 US 2024019671A1
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Prior art keywords
lens unit
optical system
lens
image
focus
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Satoshi Umehara
Kohei Kimura
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Canon Inc
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Canon Inc
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
    • G02B15/145121—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+-+
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
    • G02B15/1461—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being positive
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
    • G02B15/145105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+--
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
    • G02B15/145123—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +++-+
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/22—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances
    • G02B15/24—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group

Definitions

  • One of the aspects of the embodiments relates generally to an optical system, and more particularly to an optical system suitable for a digital video camera, a digital still camera, a broadcasting camera, a film-based camera, a surveillance camera, and the like.
  • a macro lens is known as a lens that can provide close-up imaging.
  • the macro lens has recently been demanded to have high optical performance and few aberration fluctuations in the entire focusing area.
  • Each of Japanese Patent Laid-Open Nos. 2015-57662 and 2019-164277 discloses a macro lens that corrects aberration fluctuations during focusing by moving a large focus lens unit during focusing.
  • An optical system includes, in order from an object side to an image side, a first lens unit, a second lens unit, a third lens unit, and a fourth lens unit. Each distance changes between adjacent lens units during focusing from infinity to a close distance.
  • the optical system further includes an aperture stop disposed on the image side of the second lens unit, a final lens unit disposed closest to an image plane in the optical system, the first lens unit and the final lens unit being fixed relative to the image plane during the focusing, and focus lens units disposed on the object side and the image side of the aperture stop and movable during the focusing.
  • a focus lens unit closest to the image plane among the focus lens units moves toward the image side during the focusing.
  • the optical system is configured to increase an absolute value of an imaging magnification at a shortest imaging distance to 0.5 times or higher.
  • the final lens unit includes a positive lens and a negative lens. The following inequality is satisfied:
  • dF is a sum of distances on an optical axis from a lens surface closest to an object to a lens surface closest to the image plane in each of the focus lens units
  • L is an overall lens length of the optical system.
  • FIG. 1 is a sectional view of an optical system according to Example 1.
  • FIG. 2 A is a longitudinal aberration diagram of the optical system according to Example 1 in an in-focus state at infinity
  • FIG. 2 B is a longitudinal aberration diagram of the optical system according to Example 1 at an imaging magnification of ⁇ 1.0.
  • FIG. 3 is a sectional view of an optical system according to Example 2.
  • FIG. 4 A is a longitudinal aberration diagram of the optical system according to Example 2 in an in-focus state at infinity
  • FIG. 4 B is a longitudinal aberration diagram of the optical system according to Example 2 at an imaging magnification of ⁇ 1.0.
  • FIG. 5 is a sectional view of an optical system according to Example 3.
  • FIG. 6 A is a longitudinal aberration diagram of the optical system according to Example 3 in an in-focus state at infinity
  • FIG. 6 B is a longitudinal aberration diagram of the optical system according to Example 3 at an imaging magnification of ⁇ 0.5.
  • FIG. 7 is a sectional view of an optical system according to Example 4.
  • FIG. 8 A is a longitudinal aberration diagram of the optical system according to Example 4 in an in-focus state at infinity
  • FIG. 8 B is a longitudinal aberration diagram of the optical system according to Example 4 at an imaging magnification of ⁇ 0.5.
  • FIG. 9 is a sectional view of an optical system according to Example 5.
  • FIG. 10 A is a longitudinal aberration diagram of the optical system according to Example 5 in an in-focus state at infinity
  • FIG. 10 B is a longitudinal aberration diagram of the optical system according to Example 5 at an imaging magnification of ⁇ 1.0.
  • FIG. 11 is a sectional view of an optical system according to Example 6.
  • FIG. 12 A is a longitudinal aberration diagram of the optical system according to Example 6 in an in-focus state at infinity
  • FIG. 12 B is a longitudinal aberration diagram of the optical system according to Example 6 at an imaging magnification of ⁇ 1.0.
  • FIG. 13 is a sectional view of an optical system according to Example 7.
  • FIG. 14 A is a longitudinal aberration diagram of the optical system according to Example 7 in an in-focus state at infinity
  • FIG. 14 B is a longitudinal aberration diagram of the optical system according to Example 7 at an imaging magnification of ⁇ 1.0.
  • FIG. 15 is a sectional view of an optical system according to Example 8.
  • FIG. 16 A is a longitudinal aberration diagram of the optical system according to Example 8 in an in-focus state at infinity
  • FIG. 16 B is a longitudinal aberration diagram of the optical system according to Example 8 at an imaging magnification of ⁇ 1.0.
  • FIG. 17 is a schematic diagram of an image pickup apparatus.
  • the optical system according to each example is an optical system that is used in an image pickup apparatus such as a digital video camera, a digital still camera, a broadcasting camera, a film-based camera, and a surveillance camera.
  • an image pickup apparatus such as a digital video camera, a digital still camera, a broadcasting camera, a film-based camera, and a surveillance camera.
  • FIG. 1 is a lens sectional view of an optical system L 0 according to Example 1 in the in-focus state at infinity.
  • FIG. 2 A is a longitudinal aberration diagram of the optical system L 0 according to Example 1 in the in-focus state at infinity.
  • FIG. 2 B is a longitudinal aberration diagram of the optical system L 0 according to Example 1 at an imaging magnification of ⁇ 1.0.
  • the optical system L 0 according to Example 1 is an optical system having an F-number of about four.
  • FIG. 3 is a lens sectional view of an optical system L 0 according to Example 2 in the in-focus state at infinity.
  • FIG. 4 A is a longitudinal aberration diagram of the optical system L 0 according to Example 2 in the in-focus state at infinity.
  • FIG. 4 B is a longitudinal aberration diagram of the optical system L 0 according to Example 2 at an imaging magnification of ⁇ 1.0.
  • the optical system L 0 according to Example 2 is an optical system having an F-number of about four.
  • FIG. 5 is a lens sectional view of an optical system L 0 according to Example 3 in the in-focus state at infinity.
  • FIG. 6 A is a longitudinal aberration diagram of the optical system L 0 according to Example 3 in the in-focus state at infinity.
  • FIG. 6 B is a longitudinal aberration diagram of the optical system L 0 according to Example 3 at an imaging magnification of ⁇ 0.5.
  • the optical system L 0 according to Example 3 is an optical system with an F-number of about four.
  • FIG. 7 is a lens sectional view of an optical system L 0 according to Example 4 in the in-focus state at infinity.
  • FIG. 8 A is a longitudinal aberration diagram of the optical system L 0 according to Example 4 in the in-focus state at infinity.
  • FIG. 8 B is a longitudinal aberration diagram of the optical system L 0 according to Example 4 at an imaging magnification of ⁇ 0.5.
  • the optical system L 0 according to Example 4 is an optical system having an F-number of about four.
  • FIG. 9 is a lens sectional view of an optical system L 0 according to Example 5 in the in-focus state at infinity.
  • FIG. 10 A is a longitudinal aberration diagram of the optical system L 0 according to Example 5 in the in-focus state at infinity.
  • FIG. 10 B is a longitudinal aberration diagram of the optical system L 0 according to Example 5 at an imaging magnification of ⁇ 1.0.
  • the optical system L 0 according to Example 5 is an optical system having an F-number of about four.
  • FIG. 11 is a lens sectional view of an optical system L 0 according to Example 6 in the in-focus state at infinity.
  • FIG. 12 A is a longitudinal aberration diagram of the optical system L 0 according to Example 6 in the in-focus state at infinity.
  • FIG. 12 B is a longitudinal aberration diagram of the optical system L 0 according to Example 6 at an imaging magnification of ⁇ 1.0.
  • the optical system L 0 according to Example 6 is an optical system having an F-number of about four.
  • FIG. 13 is a lens sectional view of an optical system L 0 according to Example 7 in the in-focus state at infinity.
  • FIG. 14 A is a longitudinal aberration diagram of the optical system L 0 according to Example 7 in the in-focus state at infinity.
  • FIG. 14 B is a longitudinal aberration diagram of the optical system L 0 according to Example 7 at an imaging magnification of ⁇ 1.0.
  • the optical system L 0 according to Example 7 is an optical system having an F-number of about four.
  • FIG. 15 is a lens sectional view of an optical system L 0 according to Example 8 in the in-focus state at infinity.
  • FIG. 16 A is a longitudinal aberration diagram of the optical system L 0 according to Example 8 in the in-focus state at infinity.
  • FIG. 16 B is a longitudinal aberration diagram of the optical system L 0 according to Example 8 at an imaging magnification of ⁇ 1.0.
  • the optical system L 0 according to Example 8 is an optical system having an F-number of about four.
  • the optical system L 0 includes a plurality of lens units.
  • a lens unit is a group of lenses that move together or stand still during focusing. That is, in the optical system L 0 according to each example, a distance between adjacent lens units changes during focusing from infinity to a close distance (a short distance).
  • the lens unit may include one or more lenses.
  • the lens unit may include an aperture stop.
  • Li represents an i-th lens unit where i is order of the lens units counted from the object side (i is a natural number).
  • the optical system L 0 according to each example includes a plurality of lens units Li.
  • IP is an image plane.
  • an imaging plane of a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or a CMOS sensor is placed on the image plane IP.
  • a photosensitive plane corresponding to the film plane is placed on the image plane IP.
  • An arrow relating to “focus” illustrated in each lens sectional view indicates a moving direction of the lens unit during focusing from infinity to a close distance.
  • FIGS. 2 A, 2 B, 4 A, 4 B, 6 A, 6 B, 8 A, 8 B, 10 A, 10 B, 12 A, 12 B, 14 A, 14 B, 16 A , and 16 B are aberration diagrams of the optical systems L 0 according to Examples 1 to 8, respectively.
  • FIGS. 2 A, 4 A, 6 A, 8 A, 10 A, 12 A, 14 A, and 16 A are aberration diagrams of the optical systems L 0 in the in-focus states at infinity.
  • FIGS. 2 B, 4 B, 6 B, 8 B, 10 B, 12 B, 14 B, and 16 B are aberration diagrams of the optical systems L 0 at imaging magnifications of ⁇ 1.0 or ⁇ 0.5.
  • Fno represents an F-number.
  • the spherical aberration diagram indicates spherical aberration amounts for the d-line (wavelength 587.6 nm) and g-line (wavelength 435.8 nm).
  • dS indicates an astigmatism amount on a sagittal image plane
  • dM indicates an astigmatism amount on a meridional image plane.
  • a distortion diagram illustrates a distortion amount for the d-line.
  • the distortion is expressed by a value for the d-line based on the equisolid angle projection method at the shortest and intermediate focal lengths, and a value for the d-line at the longest focal length based on the central projection method.
  • a chromatic aberration diagram illustrates a chromatic aberration amount for the g-line.
  • ⁇ is a paraxial imaging half angle of view (°).
  • the optical system L 0 includes, in order from the object side, to the image side a first lens unit L 1 , a second lens unit L 2 , a third lens unit L 3 , and a fourth lens unit L 4 .
  • a distance between adjacent lens units changes during focusing from infinity to a close.
  • An aperture stop SP is disposed on the image side of the second lens unit L 2 .
  • the first lens unit L 1 and the final lens unit located closest to the image plane in the optical system L 0 are fixed relative to the image plane IP during focusing from infinity to a close distance.
  • Focus lens units are disposed on the object side and the image side of the aperture stop SP and configured to move during focusing from infinity to a close distance.
  • a focus lens unit closest to the image plane among the focus lens units moves toward the image side during focusing from infinity to a close distance.
  • the optical system L 0 is configured to increase an absolute value of an imaging magnification at the shortest imaging distance to 0.5 times or higher.
  • the final lens unit includes a positive lens and a negative lens.
  • optical system L 0 satisfies the following inequality (1):
  • dF is a sum of distances on the optical axis from a lens surface closest to the object to a lens surface closest to the image plane in each focus lens unit
  • L is an overall lens length of the optical system L 0 .
  • Inequality (1) defines a ratio of an overall thickness dF 1 of all the focus lens units to the overall lens length L of the optical system L 0 .
  • the value dF/L is lower than the lower limit of inequality (1)
  • the overall lens length L becomes too large.
  • the overall thickness dF increases and the value dF/L is higher than the upper limit of inequality (1)
  • the size of the focus lens unit increases, focusing speed decreases, and the size of the optical system L 0 increases.
  • Each focus lens unit may consist of four lenses or less. This configuration can reduce the weight of each focus lens unit and provide quick focusing.
  • the final lens unit may consist of, in order from the object side to the image side, a positive subunit and a negative subunit. Thereby, the final lens unit has a telephoto arrangement, and the overall lens length of the optical system L 0 can be restrained from increasing.
  • the first lens unit L 1 may have positive refractive power. Thereby, the entire optical system L 0 becomes closer to the telephoto arrangement, and the overall lens length of the optical system L 0 can be restrained from increasing.
  • One focus lens unit may be disposed on each of the object side and the image side of the aperture stop SP. That is, the number of focus lens units disposed on the object side of the aperture stop SP may be one, and the number of focus lens units disposed on the image side of the aperture stop SP may be one. This configuration can simplify the focus driving unit, and restrain the optical system L 0 from becoming large.
  • the focus lens unit disposed closest to the object may have negative refractive power. Thereby, the focus lens unit can be restrained from becoming large.
  • disposing a lens unit having negative refractive power near the aperture stop SP enables the curvature of field to be easily corrected.
  • the first lens unit L 1 may include a subunit L 1 a configured to move in a direction including a component orthogonal to the optical axis during image stabilization. This configuration can suppress the influence of camera shake during imaging and provides high-resolution imaging.
  • optical system L 0 may satisfy.
  • the optical system L 0 according to each example may satisfy one or more of the following inequalities (2) to (9):
  • f1 is a focal length of the first lens unit L 1 .
  • fL is a focal length of the final lens unit.
  • ⁇ f is a lateral magnification of the focus lens unit closest to the image plane among the focus lens units.
  • ⁇ r is a combined lateral magnification of all the lens units disposed on the image side of the focus lens unit closest to the image plane among the focus lens units.
  • f is a focal length of the optical system L 0 .
  • f2 is a focal length of the second lens unit.
  • f3 is a focal length of the third lens unit.
  • f4 is a focal length of the fourth lens unit.
  • ⁇ is an imaging magnification at the shortest imaging distance of the optical system L 0 .
  • Inequality (2) defines a ratio of the focal length f1 of the first lens unit L 1 to the focal length fL of the final lens unit.
  • the focal length f1 of the first lens unit L 1 becomes small and the value
  • the overall lens length becomes long because the lens unit has no refractive power, and size and weight reductions are hindered.
  • Inequality (3) defines the focus sensitivity of the focus lens unit closest to the image plane among the focus lens units.
  • becomes lower than the lower limit of inequality (3) a moving amount of the focus lens unit closest to the image plane among the focus lens units increases, and the overall lens length of the optical system L 0 increases.
  • becomes higher than the upper limit of inequality (3) the focusing stop accuracy of the focus lens unit closest to the image plane during focusing becomes low, and it becomes difficult to achieve proper focusing.
  • Inequality (4) defines a ratio of the overall lens length L of the optical system L 0 to the focal length f of the optical system L 0 .
  • the focal length f increases and the value L/f becomes lower than the lower limit of inequality (4)
  • the overall lens length L of the optical system L 0 undesirably increases.
  • the focal length f becomes small and the value L/f becomes higher than the upper limit of inequality (4), it becomes difficult to correct various aberrations.
  • Inequality (5) defines a ratio of the focal length f1 of the first lens unit L 1 to the focal length f of the optical system L 0 .
  • the focal length f1 becomes so short that the value f1/f becomes lower than the lower limit of inequality (5)
  • correction of various aberrations becomes difficult.
  • the focal length f1 becomes so long that the value f1/f becomes higher than the upper limit of inequality (5)
  • the overall lens length of the optical system L 0 undesirably increases.
  • Inequality (6) defines a ratio of the focal length f2 of the second lens unit L 2 to the focal length f of the optical system L 0 . Inequality (6) is to reduce the occurrence of spherical aberration, and in a case where the value
  • Inequality (7) defines a ratio of the focal length f3 of the third lens unit L 3 to the focal length f of the optical system L 0 . Inequality (7) is to reduce the occurrence of spherical aberration, and in a case where the value
  • Inequality (8) defines a ratio of the focal length f4 of the fourth lens unit L 4 to the focal length f of the optical system L 0 . Inequality (8) is to reduce the occurrence of curvature of field, and in a case where the value
  • Inequality (9) defines the condition of the imaging magnification ⁇ at the shortest imaging distance of the optical system L 0 . In a case where the value
  • Inequalities (2) to (9) may be replaced with inequalities (2a) to (9a) below:
  • Inequalities (2) to (9) may be replaced with inequalities (2b) to (9b) below:
  • the optical system L 0 according to Example 1 consists of, in order from the object side to the image side, a first lens unit L 1 having positive refractive power, a second lens unit L 2 having negative refractive power, a third lens unit L 3 having positive refractive power, a fourth lens unit L 4 having negative refractive power, and a fifth lens unit L 5 having positive refractive power.
  • the first lens unit L 1 , the third lens unit L 3 , and the fifth lens unit L 5 are fixed relative to the image plane IP during focusing from infinity to a close distance.
  • the second lens unit L 2 and the fourth lens unit L 4 move toward the image side.
  • the third lens unit L 3 includes an aperture stop SP, and the aperture stop SP is disposed closest to the object in the third lens unit L 3 .
  • the optical system L 0 according to Example 2 consists of, in order from the object side to the image side, a first lens unit L 1 having positive refractive power, a second lens unit L 2 having positive refractive power, a third lens unit L 3 having positive refractive power, a fourth lens unit L 4 having negative refractive power, and a fifth lens unit L 5 having positive refractive power.
  • the first lens unit L 1 , the third lens unit L 3 , and the fifth lens unit L 5 are fixed relative to the image plane IP during focusing from infinity to a close distance.
  • the second lens unit L 2 moves toward the object side
  • the fourth lens unit L 4 moves toward the image side.
  • the third lens unit L 3 includes an aperture stop SP, and the aperture stop SP is disposed closest to the object in the third lens unit L 3 .
  • the optical system L 0 according to Example 3 consists of, in order from the object side to the image side, a first lens unit L 1 having positive refractive power, a second lens unit L 2 having negative refractive power, a third lens unit L 3 having positive refractive power, a fourth lens unit L 4 having negative refractive power, and a fifth lens unit L 5 having positive refractive power.
  • the first lens unit L 1 , the third lens unit L 3 , and the fifth lens unit L 5 are fixed relative to the image plane IP during focusing from infinity to a close distance.
  • the second lens unit L 2 and the fourth lens unit L 4 move toward the image side.
  • the third lens unit L 3 includes an aperture stop SP, and the aperture stop SP is disposed closest to the object in the third lens unit L 3 .
  • the optical system L 0 according to Example 4 consists of, in order from the object side to the image side, a first lens unit L 1 having positive refractive power, a second lens unit L 2 having negative refractive power, a third lens unit L 3 having positive refractive power, a fourth lens unit L 4 having negative refractive power, a fifth lens unit L 5 having positive refractive power, and a sixth lens unit L 6 having positive refractive power.
  • the first lens unit L 1 , the third lens unit L 3 , and the sixth lens unit L 6 are fixed relative to the image plane IP during focusing from infinity to a close distance.
  • the second lens unit L 2 , the fourth lens unit L 4 , and the fifth lens unit L 5 move toward the image side during focusing from infinity to a close distance.
  • the third lens unit L 3 includes an aperture stop SP, and the aperture stop SP is disposed closest to the object in the third lens unit L 3 .
  • the optical system L 0 according to Example 5 consists of, in order from the object side to the image side, a first lens unit L 1 having positive refractive power, a second lens unit L 2 having negative refractive power, a third lens unit L 3 having positive refractive power, a fourth lens unit L 4 having negative refractive power, and a fifth lens unit L 5 having negative refractive power.
  • the first lens unit L 1 , the third lens unit L 3 , and the fifth lens unit L 5 are fixed relative to the image plane IP during focusing from infinity to a close distance.
  • the second lens unit L 2 and the fourth lens unit L 4 move toward the image side.
  • the third lens unit L 3 includes an aperture stop SP, and the aperture stop SP is disposed closest to the object in the third lens unit L 3 .
  • the optical system L 0 according to Example 6 consists of, in order from the object side to the image side, a first lens unit L 1 having positive refractive power, a second lens unit L 2 having negative refractive power, an aperture stop SP, a third lens unit L 3 having negative refractive power, and a fourth lens unit L 4 having positive refractive power.
  • the first lens unit L 1 , the aperture stop SP, and the fourth lens unit L 4 are fixed relative to the image plane IP during focusing from infinity to a close distance. During focusing from infinity to a close distance, the second lens unit L 2 and the third lens unit L 3 move toward the image side.
  • the optical system L 0 according to Example 7 consists of, in order from the object side to the image side, a first lens unit L 1 having positive refractive power, a second lens unit L 2 having negative refractive power, a third lens unit L 3 having positive refractive power, a fourth lens unit L 4 having negative refractive power, and a fifth lens unit L 5 having negative refractive power.
  • the third lens unit L 3 includes an aperture stop SP, and the aperture stop SP is disposed closest to the object in the third lens unit L 3 .
  • the optical system L 0 according to Example 8 consists of, in order from the object side to the image side, a first lens unit L 1 having positive refractive power, a second lens unit L 2 having negative refractive power, a third lens unit L 3 having positive refractive power, a fourth lens unit L 4 having negative refractive power, and a fifth lens unit L 5 having positive refractive power.
  • the first lens unit L 1 , the third lens unit L 3 , and the fifth lens unit L 5 are fixed relative to the image plane IP during focusing from infinity to a close distance.
  • the second lens unit L 2 and the fourth lens unit L 4 move toward the image side.
  • the third lens unit L 3 includes an aperture stop SP, and the aperture stop SP is disposed closest to the object in the third lens unit L 3 .
  • each example can reduce the weight and size of the focus lens unit, improve the focusing stop accuracy, increase the focusing speed, and provide a compact and high-performance optical system.
  • r represents a radius of curvature of each optical surface
  • d (mm) represents an on-axis distance (distance on the optical axis) between an m-th surface and an (m+1)-th surface, where m is a surface number counted from the light incident side
  • nd represents a refractive index for the d-line of each optical element
  • vd represents an Abbe number of the optical element.
  • the Abbe number vd of a certain material is expressed as follows:
  • An effective diameter means a diameter of an area (effective area) of the lens surface through which an effective light beam that contributes to imaging passes.
  • values of d, focal length (mm), F-number, and half angle of view (°) are set in a case where the optical system according to each example is in an in-focus state on an infinity object.
  • “Back focus BF” is a distance on the optical axis from the final lens surface (lens surface closest to the image plane) to the paraxial image plane expressed in air conversion length.
  • An “overall lens length” is a length obtained by adding the back focus to a distance on the optical axis from the first lens surface (lens surface closest to the object) of the optical system L 0 to the final lens surface.
  • the term “lens unit” includes one or more lenses.
  • optical surface is an aspherical surface
  • asterisk * is attached to the right side of the surface number.
  • the aspherical shape is expressed as follows:
  • X is a displacement amount from a surface vertex in the optical axis direction
  • h is a height from the optical axis in a direction orthogonal to the optical axis
  • a light traveling direction is set positive
  • R is a paraxial radius of curvature
  • k is a conic constant
  • A4, A6, A8, A10, and A12 are aspherical coefficients. “e ⁇ XX” in each aspheric coefficient means “ ⁇ 10 ⁇ XX .”
  • reference numeral 13 denotes a camera body
  • reference numeral 11 denotes an imaging optical system that includes one of the optical systems L 0 according to Examples 1 to 8.
  • Reference numeral 12 denotes a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor, which is built in the camera body 13 and configured to receive and photoelectrically convert an optical image formed by the imaging optical system 11 .
  • the camera body 13 may be a so-called single-lens reflex camera having a quick turn mirror, or a so-called mirrorless camera without a quick turn mirror.
  • An optical apparatus including the imaging optical system 11 may be attached to the camera body 13 , or the optical apparatus including the camera body 13 and the imaging optical system 11 may be integrated so that they are undetachable.
  • Applying the optical system L 0 according to each example to an image pickup apparatus such as a digital still camera can provide an image pickup apparatus having a compact lens.
  • this embodiment can reduce the weight and size of the focus lens unit, improve the focusing stop accuracy, increase the focusing speed, and provide a compact and high-performance optical system.

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  • Optics & Photonics (AREA)
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